NEJE A40640Ⅱ 12W 450nm Zoom Laser Module - - Direct use, no air pump required
450nm 6W 12V Laser Module for Carving and Cutting- NEJE N40630 - Built-in air assist -square focus
NEJE E40 12W 450nm High Definition Fixed-Focus Laser Module - Direct use, no air pump required
450nm 6W 12V Laser Module with Ultimate Focus for Metal Engraving and wood Carving - NEJE E30130- Need air assistance to protect the lens